Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
hieu van » hieu va, thien van, lieu va
sach thu » sach thieu, sach tham, cach thuc
thuc dan » thuc hanh, hoc dan, thuc vat
thang ma » thang mua, tang ma, thang va
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
luy tre » luyen tre
ma hoi » mai hoi, xa hoi, ma hoa
vi luy » vi lua, vi luu

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 thu) or (sach thue)) thang ma hoi. hieu van cau ((truc va) or (thuc dan)) hanh vi luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach thue)) thang ma hoi. hieu van cau ((truc va) OR (thuc dan)) hanh vi luy tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach thue)) thang ma hoi. hieu van cau ((truc va) or (thuc dan)) hanh vi luy tre*.