Perhaps you should try some spelling variations:
hac truc » hoc truc, hang truc, sach truc
su sach » so sach, vu sach
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua te » cua tu
va hac » van hac, va khac, va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) OR (nang ma)) hoi. hieu va hac truc va dan vi ((cua te) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (nang ma)) hoi. hieu va hac truc va dan vi ((cua te) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) OR (nang ma)) hoi. hieu va hac truc va dan vi ((cua te) OR (cuu tre))*.