Perhaps you should try some spelling variations:
vanh tai » van tai, hanh tai, anh tai
vanh dai » van dai, lanh dao, van dao
nhan luc » nang luc
tu sach » thu sach, te sach, tu cach
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
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 dang xa hoi. hieu va nhan luc va ((vanh dai) or (vanh tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky dang xa hoi. hieu va nhan luc va ((vanh dai) OR (vanh tai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky dang xa hoi. hieu va nhan luc va ((vanh dai) or (vanh tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky dang xa hoi. hieu va nhan luc va ((vanh dai) or (vanh tai)) cuu tre*.