Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nam tuc » nam thuc, nam truc, nam tu
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
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: tu sach ky nang x hoi. ((hieu va) or (thien van)) nam tuc va hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((hieu va) OR (thien van)) nam tuc va hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu va) or (thien van)) nam tuc va hanh vi cau tren*.