Perhaps you should try some spelling variations:
viet tech » viet sach
tech nuoc » dich nuoc, sach nuoc
lieu viet » sieu viet, tieu viet, dien viet
va danh » va dinh, va hanh, dia danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
va dan » ca dan, va dao, va dau
di cua » dai cua, doi cua, de cua
vu sac » vu sach, vu san, va sac

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang ((ma hoi) or (xa hoi)). lieu viet tech nuoc ((va danh) or (va dan)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((ma hoi) OR (xa hoi)). lieu viet tech nuoc ((va danh) OR (va dan)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang ((ma hoi) or (xa hoi)). lieu viet tech nuoc ((va danh) or (va dan)) di cua tre*.