Perhaps you should try some spelling variations:
thien van » thi van
hai thuc » thai thuc, dai thuc, ha thuc
va thanh » gia thanh, ban thanh, va tinh
tu cach » tu cac
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va danh, ban hanh
van hai » van ha, van chat, van hanh
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) ky nang ma hoi. thien van hai thuc ((va hanh) OR (va thanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang ma hoi. thien van hai thuc ((va hanh) OR (va thanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ky nang ma hoi. thien van hai thuc ((va hanh) OR (va thanh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang ma hoi. thien van hai thuc ((va hanh) OR (va thanh)) tai cua tre*.