Perhaps you should try some spelling variations:
cau trieu » cac trieu, cau triet, chua trieu
thuc van » thuc vat, thuc dan, thuc va
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
tuc van » truc van, tuc va, duc van
su sach » so sach, vu sach
ty hang » ly hang, thi hang, thu hang
van cam » van nam, van lam, van cau
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty hang) or (ty xang)) co hoc. hieu van cam ((tuc van) OR (thuc van)) hanh va cau trieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ty xang)) co hoc. hieu van cam ((tuc van) OR (thuc van)) hanh va cau trieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) or (ty xang)) co hoc. hieu van cam ((tuc van) OR (thuc van)) hanh va cau trieu".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (ty xang)) co hoc. hieu van cam ((tuc van) OR (thuc van)) hanh va cau trieu*.