Perhaps you should try some spelling variations:
xa khanh » xa thanh, van khanh, dat khanh
te sach » toc sach
nam tuc » nam thuc, nam truc, nam thuoc
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
nam tu » nam thu, nam thuc
ma hoi » mai hoi, xa hoi, ma hoa
vai cu » vai cua
van cu » van cau, van chu, van cua

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