Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
va hac » van hac, va khac, va cac
tuc va » thuc va, truc va, duc va
vi cau » va cau, ve cau, di cau
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu va hac ((tuc va) or (tuc xa)) danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu va hac ((tuc va) OR (tuc xa)) danh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu va hac ((tuc va) or (tuc xa)) danh vi cau tren*.