Perhaps you should try some spelling variations:
hoc giai » hoc giao, hoc dai, so giai
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hoc gia » hoc giao, toc gia, quoc gia
nang xa » nang x, lang xa, nang ma
vi su » va su, ve su, oi su
ki su » ky 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 xa hoi. hieu van cham ((hoc gia) OR (hoc giai)) thanh ((vi su) or (ki su)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu van cham ((hoc gia) OR (hoc giai)) thanh ((vi su) OR (ki su)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. hieu van cham ((hoc gia) OR (hoc giai)) thanh ((vi su) or (ki su)) tren".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu van cham ((hoc gia) OR (hoc giai)) thanh ((vi su) or (ki su)) tren*.