Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
sach tranh » canh tranh
tranh thuc » trinh thuc, trang thuc, thanh thuy
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoi » cach thoi, cac khoi, cac thoi
khoi phau » khoa phau, khoai chau, khai pha
thuc hach » thuc hanh, chuc hach, thuoc sach
hach toan » thanh toan, manh toan
toan toan » toan tran, thanh toan, toan doanh
lenh dao » lanh dao, benh dai, minh dao
dao thuc » dan thuc, dao tuc, do thuc
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu lenh dao thuc cach khoi phau thong ) or ( tu sach tranh thuc hach toan toan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu lenh dao thuc cach khoi phau thong ) OR ( tu sach tranh thuc hach toan toan thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu lenh dao thuc cach khoi phau thong ) or ( tu sach tranh thuc hach toan toan thong ))*.