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