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