Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nang dai » nang dau, nang tai, lang dai
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
hieu va » lieu va
tham lo » tham do, tham hoa, pham lao
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tri cua, dai cua
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 ky nang dai hoi. ((hieu va) OR (hieu qua)) tham lo va hanh ((tai cua) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang dai hoi. ((hieu va) OR (hieu qua)) tham lo va hanh ((tai cua) OR (tai cuc)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang dai hoi. ((hieu va) OR (hieu qua)) tham lo va hanh ((tai cua) or (tai cuc)) tre*".