Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cu tren » tu tren, dua tren
va dam » van dam, va dao, va dau
dam tu » nam tu, cam tu, tam tu
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu va dam tu va hanh vi ((dau tieng) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu va dam tu va hanh vi ((dau tieng) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu va dam tu va hanh vi ((dau tieng) or (cu tren))*.