Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
khanh vai » khanh van, hanh vi, hanh va
dat khanh » van khanh, duy khanh
dau tren » dau tien, dat tren, dau trong
nam tuc » nam thuc, nam truc, nam tu
tuc dat » tu dat, tuc dan, tuc hat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
va nam » van nam, ha nam, va nay

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 ky ((nang ma) OR (tang ma)) hoi. hieu va nam tuc dat khanh vai ((dau tren) or (dau tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ma) OR (tang ma)) hoi. hieu va nam tuc dat khanh vai ((dau tren) OR (dau tieng)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ma) OR (tang ma)) hoi. hieu va nam tuc dat khanh vai ((dau tren) or (dau tieng))".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang ma) OR (tang ma)) hoi. hieu va nam tuc dat khanh vai ((dau tren) or (dau tieng))*.