Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach ty » sach y, sach tu, sach thu
hoi cua » hoi chuc
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, va hanh
cham lo » cham o, cam lo, cham soc
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
ty nang » ky nang, ty xang, ty hang
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty nang ((cao hoi) OR (cao hoc)). hieu vu cham lo va danh ((lai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty nang ((cao hoi) OR (cao hoc)). hieu vu cham lo va danh ((lai cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty nang ((cao hoi) OR (cao hoc)). hieu vu cham lo va danh ((lai cua) or (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty nang ((cao hoi) OR (cao hoc)). hieu vu cham lo va danh ((lai cua) or (hoi cua)) tre*.