Perhaps you should try some spelling variations:
dat duoc » dat nuoc, da duoc, luat duoc
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, dao hanh
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
ve dat » de dat, va dat, ve dao
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua
vu san » va san, vu ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu san ky tang ma hoi. hieu ve dat duoc ((((va hanh) OR (ban hanh))) or (va danh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky tang ma hoi. hieu ve dat duoc ((((va hanh) OR (ban hanh))) OR (va danh)) di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky tang ma hoi. hieu ve dat duoc ((((va hanh) OR (ban hanh))) or (va danh)) di cua tre*".