Perhaps you should try some spelling variations:
khang thuoc » khong thuoc, dang thuoc, hanh thuoc
van khang » van khanh, van thanh, van quang
thuoc ma » hoc ma, duoc ma
cua khau » cua khu, xuat khau, cua khach
khau tai » pham tai, nhan tai
vu sach » vu bach, su sach, vu khach
so sach » so sanh, bo sach, co sach
hoc van » hoc dan, hoc va, hoc vat
hoi cua » hoi chuc
mo hoc » mon hoc, co hoc
ma hoi » mai hoi, xa hoi, ma hoa

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) or (so sach)) hoc tap, nghien cuu mo hoc van khang thuoc ma hoi cua khau tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) hoc tap, nghien cuu mo hoc van khang thuoc ma hoi cua khau tai.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) hoc tap, nghien cuu mo hoc van khang thuoc ma hoi cua khau tai*.