Perhaps you should try some spelling variations:
van cham » van tham, va cham, van pham
van chat » cao chat
thanh vi » hanh vi, thanh va, thanh ve
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hoc gia » hoc giao, hoc giai, toc gia
su tren » su tien, tu tren, cu tren
ma hoi » mai hoi, xa hoi, ma hoa
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ma hoi. hieu ((van cham) or (van chat)) hoc gia thanh vi su tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ma hoi. hieu ((van cham) OR (van chat)) hoc gia thanh vi su tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ma hoi. hieu ((van cham) or (van chat)) hoc gia thanh vi su tren*.