Perhaps you should try some spelling variations:
van triet » va triet, van thiet, van trieu
hanh dam » thanh dam, hanh lam, hanh nam
thuc dan » thuc hanh, hoc dan, thuc vat
thuc van » thuc vat, thuc va, thuc hanh
sach thu » sach thue, sach thieu, sach tham
dam van » dao van, nam van, pham van
tu sach » thu sach, su sach, te sach
hanh xa » hanh va, hanh xu, canh xa
hanh ma » hanh mau, hanh may, hanh va
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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 thu ((hanh xa) or (hanh ma)) hoi. hieu ve cam ((thuc van) or (thuc dan)) hanh dam van triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((hanh xa) OR (hanh ma)) hoi. hieu ve cam ((thuc van) OR (thuc dan)) hanh dam van triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((hanh xa) or (hanh ma)) hoi. hieu ve cam ((thuc van) or (thuc dan)) hanh dam van triet*.