Perhaps you should try some spelling variations:
cau tieng » tu tieng, va tieng, ban tieng
khanh vai » khanh van, hanh vi, hanh va
dau tren » dau tien, dat tren, dau tieng
xa khanh » xa thanh, van khanh, dat khanh
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
nam tuc » nam thuc, nam truc, nam tu
ma hoi » mai hoi, xa hoi, ma hoa
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: ((toc sach) OR (hoc sach)) ky nang ma hoi. hieu va nam tuc xa khanh vai ((dau tren) or (cau tieng))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky nang ma hoi. hieu va nam tuc xa khanh vai ((dau tren) OR (cau tieng)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky nang ma hoi. hieu va nam tuc xa khanh vai ((dau tren) or (cau tieng))".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ky nang ma hoi. hieu va nam tuc xa khanh vai ((dau tren) or (cau tieng))*.