Perhaps you should try some spelling variations:
hoc khong » hoa khong, hoc hong, khoi khong
sach tren » sach tien, sach tranh
dao thuc » dan thuc, dao tuc, do thuc
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
khoa hoc » hoa hoc
tren duy » tran duy, trinh duy, tren dia
hoc thon » hoc thong, hoa thon, hoc than
anh dao » lanh dao, hanh dao, anh dat
vu sach » vu bach, su sach, vu khach
duy anh » duc anh, duy khanh, thuy anh
tu anh » tu hanh, tu manh, thu anh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu anh dao thuc anh khoa hoc khong ) or ( vu sach tren duy anh khoa hoc thon ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu anh dao thuc anh khoa hoc khong ) OR ( vu sach tren duy anh khoa hoc thon )).
• Adding a wildcard symbol may retrieve word variants: (( tu anh dao thuc anh khoa hoc khong ) or ( vu sach tren duy anh khoa hoc thon ))*.