Perhaps you should try some spelling variations:
khang thuoc » khong thuoc, dang thuoc, hanh thuoc
hong phuoc » hoang phuong
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
bai phap » ban phap, giai phap, bai tap
phap vat » phap luat, phap phat, phap viet
tu sach » thu sach, su sach, te sach
hoi bai » hoc bai, hoi tai, khoi bay
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cuu dong co phan ((khang thuoc) or (hong phuoc)) va hoi bai phap vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu dong co phan ((khang thuoc) OR (hong phuoc)) va hoi bai phap vat.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong co phan ((khang thuoc) or (hong phuoc)) va hoi bai phap vat*.