Perhaps you should try some spelling variations:
cau tren » cu tren, ca tren, cau treo
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
va tinh » may tinh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ma hoi. hieu va cao tuc ((va tinh) or (gia thanh)) thai ((cau tren) OR (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu va cao tuc ((va tinh) OR (gia thanh)) thai ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu va cao tuc ((va tinh) or (gia thanh)) thai ((cau tren) OR (dau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu va cao tuc ((va tinh) or (gia thanh)) thai ((cau tren) OR (dau tren))*.