Perhaps you should try some spelling variations:
viet tech » viet sach
lieu viet » sieu viet, tieu viet, dien viet
tech nuoc » dich nuoc, sach nuoc
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
me hoi » le hoi
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ((me hoi) or (xa hoi)). lieu viet tech nuoc ((va danh) OR (va dinh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((me hoi) OR (xa hoi)). lieu viet tech nuoc ((va danh) OR (va dinh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ((me hoi) or (xa hoi)). lieu viet tech nuoc ((va danh) OR (va dinh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((me hoi) or (xa hoi)). lieu viet tech nuoc ((va danh) OR (va dinh)) di cua tre*.