Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
lam duoc » luat duoc, lam thuoc, tao duoc
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
tu cach » tu cac
tang xa » trang xa, tang ma, lang xa
te sach » toc sach
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (te sach)) kho tang xa hoi. hieu van ((lam duoc) or (nam duoc)) va hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) kho tang xa hoi. hieu van ((lam duoc) OR (nam duoc)) va hanh ve cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) kho tang xa hoi. hieu van ((lam duoc) or (nam duoc)) va hanh ve cau tren*.