Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cham hoc » cham soc, chat hoc, cham hoi
cau theo » cau thi, cau tao
nang ma » tang ma, sang ma, nang cao
hieu vu » hieu va, hieu ve, dieu vu
hieu su » hieu sau, tieu su, hieu so
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach v nang ma hoi. ((hieu vu) or (hieu su)) cham hoc va danh di cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach v nang ma hoi. ((hieu vu) OR (hieu su)) cham hoc va danh di cau theo.
• Adding a wildcard symbol may retrieve word variants: hoc sach v nang ma hoi. ((hieu vu) or (hieu su)) cham hoc va danh di cau theo*.