Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
lon hanh » lon thanh, hon hanh, son thanh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve kham » vu kham, va kham, ve cham
kham ly » khao ly, khanh ly
tai cua » thai cua, tai cuc, dai cua
ma hoi » mai hoi, ma hoa, me hoi
ly lon » ly don, ly luong

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 ky nang ((ma hoi) OR (xa hoi)). hieu ve kham ly lon hanh ((tai cua) or (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ve kham ly lon hanh ((tai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ve kham ly lon hanh ((tai cua) or (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ve kham ly lon hanh ((tai cua) or (tri cua)) tre*.