Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
cam truc » cau truc, nam truc, lam truoc
truc va » thuc va, thuc vat, trung va
van cam » van nam, van lam, van cau
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hay cu » hat cu, hay su
ha cu » hat cu, nha cu, ha vu

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 y ((nang xa) or (nang ma)) hoi. thien van cam truc va thanh ((ha cu) OR (hay cu)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (nang ma)) hoi. thien van cam truc va thanh ((ha cu) OR (hay cu)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (nang ma)) hoi. thien van cam truc va thanh ((ha cu) OR (hay cu)) tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (nang ma)) hoi. thien van cam truc va thanh ((ha cu) OR (hay cu)) tren*.