Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
su triet » su viet, su tien, ve triet
te sach » toc sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
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: ((thu sach) or (te sach)) ty nang xa hoi. thien van cam ((duc anh) or (duc tan)) hanh dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ty nang xa hoi. thien van cam ((duc anh) OR (duc tan)) hanh dai su triet.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ty nang xa hoi. thien van cam ((duc anh) or (duc tan)) hanh dai su triet*.