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