Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
cau treo » cau theo, cau tren, cau triet
thang ma » thang mua, thang va, than ma
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, hang di
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
van dau » van dao, phan dau
di cau » da cau, diem cau

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 thue ((thang ma) or (tang ma)) hoi. hieu van dau ((truc va) or (thuc va)) hanh di cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thue ((thang ma) OR (tang ma)) hoi. hieu van dau ((truc va) OR (thuc va)) hanh di cau treo.
• Adding a wildcard symbol may retrieve word variants: tu sach thue ((thang ma) or (tang ma)) hoi. hieu van dau ((truc va) or (thuc va)) hanh di cau treo*.