Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, lieu va, hieu ve
hanh dao » lanh dao, thanh dat, thanh dam
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cam tuc » cam xuc, cam tu, nam thuc
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. ((hieu van) OR (thien van)) cam tuc va hanh dao ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang xa hoi. ((hieu van) OR (thien van)) cam tuc va hanh dao ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. ((hieu van) OR (thien van)) cam tuc va hanh dao ((cua tre) or (cuu tre))*.