Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach thu » sach thue, sach thieu, sach tham
cam truc » cau truc, nam truc, lam truoc
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
dan vai » dan va, dan tai, dan vat
truc va » thuc va, thuc vat, trung va
van cam » van nam, van lam, van cau
tang ma » mang may, tang van
mang xa » lang xa, mang may, dang xay
cuu tre » cau tren, cau treo
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach thu ((mang xa) or (tang ma)) hoi. hieu van cam truc va dan vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach thu ((mang xa) OR (tang ma)) hoi. hieu van cam truc va dan vai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach thu ((mang xa) or (tang ma)) hoi. hieu van cam truc va dan vai ((cua tre) OR (cuu tre))*".