Perhaps you should try some spelling variations:
phai thong » phap thong, phai tuong, phan thong
doanh khoa » toan khoa
sach tren » sach tien, sach tranh
cach hoan » cac khoan, hach toan, sach han
hoan phai » khoan phai, toan phai, hoang thai
cach thuc » anh thuc, cac thu
khoa khau » khoa kham, khoa phau, khoa chau
khau tong » khau thong, khau cong, khau thuong
vu doanh » va doanh, su doanh, van doanh
tu sach » thu sach, su sach, te sach
tren ve » tren xe, tren he, tren vi
ve cach » va cach, ve cac, ve canh
tu cach » tu cac
thuc vu » phuc vu, thuc va, thuc ve

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 tren ve cach hoan phai thong ) or ( tu cach thuc vu doanh khoa khau tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren ve cach hoan phai thong ) OR ( tu cach thuc vu doanh khoa khau tong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren ve cach hoan phai thong ) or ( tu cach thuc vu doanh khoa khau tong ))*.