Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, hien hanh
thanh van » thanh san, thanh toan, thanh phan
hieu hien » bieu hien, dieu hien, chieu chien
va thanh » gia thanh, ban thanh, va tinh
bach luc » bach tuoc, bach hue, bach qua
cau tren » cu tren, dau tren, ca tren
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
cuu tre » cua tre, cau treo
tu sach » thu sach, te sach, tu cach
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky tang xa hoi. hieu hien bach luc va thanh van ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky tang xa hoi. hieu hien bach luc va thanh van ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky tang xa hoi. hieu hien bach luc va thanh van ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky tang xa hoi. hieu hien bach luc va thanh van ((cuu tre) OR (cau tren))*.