Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
toc sach » hoc sach, doc sach, thuoc sach
duoc dat » duoc bat, duoc dai, duoc dan
su triet » su viet, su tien, ve triet
van cam » van nam, van cau, van dam
van lam » van nam
sach ty » sach y, sach tu, sach thu
suc bat » luc bat, duoc bat
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
dai su » dai sua, dai so, dan su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang xa hoi. hieu ((van cam) or (van lam)) ((suc bat) or (duoc dat)) thanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. hieu ((van cam) OR (van lam)) ((suc bat) OR (duoc dat)) thanh dai su triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu ((van cam) or (van lam)) ((suc bat) or (duoc dat)) thanh dai su triet*.