Perhaps you should try some spelling variations:
va trinh » van trinh, va tinh, lap trinh
toc sach » hoc sach, doc sach, thuoc sach
tu sach » thu sach, su sach, te sach
dan cua » dan ca, ban cua, dai cua
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
dao cua » dai cua, day cua, do cua
cau luc » cau truc, cau phuc
ve cau » ke cau, va cau, ve cac
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 (toc sach)) ky tang xa hoi. hieu ve cau luc va trinh ((dao cua) OR (dan cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky tang xa hoi. hieu ve cau luc va trinh ((dao cua) OR (dan cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (toc sach)) ky tang xa hoi. hieu ve cau luc va trinh ((dao cua) OR (dan cua)) tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky tang xa hoi. hieu ve cau luc va trinh ((dao cua) OR (dan cua)) tu*.