Perhaps you should try some spelling variations:
luc nganh » chuc nganh, luat nganh, luc canh
thu sach » tu sach, thuat sach, thuoc sach
luc ngan » luc nhan, luat ngan, vu ngan
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ve cau » ke cau, ve cac, le cau
ma hoi » mai hoi, xa hoi, ma hoa
vi cau » di cau, viet cau
va cau » van cau, va cac, va dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang ma hoi. hieu ve cau ((luc ngan) or (luc nganh)) hang ((vi cau) or (va cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ma hoi. hieu ve cau ((luc ngan) OR (luc nganh)) hang ((vi cau) OR (va cau)) tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ma hoi. hieu ve cau ((luc ngan) or (luc nganh)) hang ((vi cau) or (va cau)) tren*.