Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
cam thuc » am thuc, nam thuc, cam thu
hieu van » thien van, lieu va, hieu ve
tay lang » tai lang, tay tang, tay quang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
te sach » toc sach
tu sach » thu sach, su sach, tu cach
vi su » va su, ve su, ki su

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 (te sach)) tay lang xa hoi. ((hieu van) or (hieu va)) cam thuc vat thanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) tay lang xa hoi. ((hieu van) OR (hieu va)) cam thuc vat thanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) tay lang xa hoi. ((hieu van) or (hieu va)) cam thuc vat thanh vi su triet*.