Perhaps you should try some spelling variations:
cuu thuc » cuu tac
dan hanh » dang hanh, dan khanh, dan thanh
hieu van » thien van, lieu va, hieu ve
thuc dan » thuc hanh, hoc dan, thuc vat
hanh le » thanh le, hanh ve, hanh de
tang xa » trang xa, tang ma, lang xa
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
le cua » ly cua
cua te » cua tu

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 ky) OR (sach y)) tang xa hoi. ((hieu van) or (hieu va)) cuu thuc dan hanh le cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) tang xa hoi. ((hieu van) OR (hieu va)) cuu thuc dan hanh le cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) tang xa hoi. ((hieu van) or (hieu va)) cuu thuc dan hanh le cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) tang xa hoi. ((hieu van) or (hieu va)) cuu thuc dan hanh le cua te*.