Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
danh tai » doanh tai, dinh tai, hanh tai
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
dai hoi » dai hoc, dai hai
dai moi » doi moi
cuc tre » duc tre, cua tre, cuu tre
sac ky » cac ky, sai ky
lao va » tao va, cao va, bao va
lo va » lo van, ly va, le 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 sac ky nang ((dai hoi) OR (dai moi)). hieu va tham ((lo va) or (lao va)) danh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang ((dai hoi) OR (dai moi)). hieu va tham ((lo va) OR (lao va)) danh tai cuc tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky nang ((dai hoi) OR (dai moi)). hieu va tham ((lo va) or (lao va)) danh tai cuc tre*".