Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cuu tre, cua triet, dua tren
va lang » va nang, hoa lang
va hang » van hang, va nang, va hanh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
va cam » va cham, va cac, va cao
cua te » cua tu

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 tang xa hoi. hieu va cam luc ((va hang) OR (va lang)) tai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang xa hoi. hieu va cam luc ((va hang) OR (va lang)) tai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang xa hoi. hieu va cam luc ((va hang) OR (va lang)) tai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang xa hoi. hieu va cam luc ((va hang) OR (va lang)) tai ((cua tre) or (cua te))*.