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
cau treo » cau theo, cau tren, cau triet
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau tren
lam luc » lao luc, lam duoc
luc va » duc va, tuc va, loc va
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 ty nang x hoi. ((hieu van) or (thien van)) lam luc va danh vi ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang x hoi. ((hieu van) OR (thien van)) lam luc va danh vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang x hoi. ((hieu van) or (thien van)) lam luc va danh vi ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang x hoi. ((hieu van) or (thien van)) lam luc va danh vi ((cuu tre) OR (cau treo))*.