Perhaps you should try some spelling variations:
dua tren » dung tren
va thanh » ban thanh, va tinh, le thanh
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
nang ma » tang ma, sang ma, nang cao
cu tren » tu tren
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang

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 cam tuc ((va thanh) or (gia thanh)) hai ((cu tren) OR (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu va cam tuc ((va thanh) OR (gia thanh)) hai ((cu tren) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu va cam tuc ((va thanh) or (gia thanh)) hai ((cu tren) OR (dua tren))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu va cam tuc ((va thanh) or (gia thanh)) hai ((cu tren) OR (dua tren))*.