Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
hanh den » hanh de, nhanh dien, hanh dong
nang mai » nang ma, nang tai, lang mai
thuc dan » thuc hanh, hoc dan, thuc vat
thuc day » thuc vat
thi van » thi lan, thi hanh, thi nang
sach tu » sach thu, cach tu, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
su tien » su kien, su hien, tu tieng
den su » dan su, nen su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tu) or (sach thue)) nang mai hoi. thi van nam ((thuc day) OR (thuc dan)) hanh den su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (sach thue)) nang mai hoi. thi van nam ((thuc day) OR (thuc dan)) hanh den su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) or (sach thue)) nang mai hoi. thi van nam ((thuc day) OR (thuc dan)) hanh den su tien".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (sach thue)) nang mai hoi. thi van nam ((thuc day) OR (thuc dan)) hanh den su tien*.