Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
cam tuc » cam xuc, cam tu, nam thuc
tuc ban » thuc ban, truc ban, tu ban
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
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: te sach y nang ma hoi. ((hieu va) OR (hieu qua)) cam tuc ban thanh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. ((hieu va) OR (hieu qua)) cam tuc ban thanh dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. ((hieu va) OR (hieu qua)) cam tuc ban thanh dai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. ((hieu va) OR (hieu qua)) cam tuc ban thanh dai ((cua tre) or (cua te))*.