Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach v nang xa hoi. ((hieu ve) or (hieu va)) cau truc va hanh vi ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach v nang xa hoi. ((hieu ve) OR (hieu va)) cau truc va hanh vi ((cua te) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach v nang xa hoi. ((hieu ve) or (hieu va)) cau truc va hanh vi ((cua te) or (cuu tre))*.