Perhaps you should try some spelling variations:
cac khoi » cac thoi, cac khoan, cach thoi
te sach » toc sach
hanh va » hang va, hanh vi
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
ve cau » ke cau, va cau, ve cac
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va
loc va » hoc va
va qua » va quan, va quy, va quang

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 ly nang ((ma hoi) or (cac khoi)). hieu ve cau ((luc va) or (loc va)) hanh va qua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((ma hoi) OR (cac khoi)). hieu ve cau ((luc va) OR (loc va)) hanh va qua su.
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((ma hoi) or (cac khoi)). hieu ve cau ((luc va) or (loc va)) hanh va qua su*.