Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
doc sach » hoc sach, toc sach, nuoc sach
hanh lam » thanh lap, hanh kem, hanh va
va hanh » van hanh, va thanh, va danh
qua cau » quan cau, qua cac, qua ca
te sach » toc sach
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang
cau luc » cau truc, cau phuc
luc va » duc va, tuc va, loc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (doc sach)) vu nang xa hoi. hieu qua cau luc va hanh lam ((cua te) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) vu nang xa hoi. hieu qua cau luc va hanh lam ((cua te) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) vu nang xa hoi. hieu qua cau luc va hanh lam ((cua te) or (va trien))*.