Perhaps you should try some spelling variations:
hoach tren » hoach trong, hoach toan, hoc tren
kham thong » khap thong, khau thong, pham thuong
khoan phap » khoan phai, khoa phau, han phap
phap thong » phap phong, phap chong, pho thong
khoa kham » kho khan, khoa than
cao khoan » cac khoan, cao khoa, tao khoang
sach tri » sach tai, sach tren, sach truc
lao khoa » lo khoa, da khoa, ly khoa
tren tuc » tren thuc, trong tuc, tren thi
tu sach » thu sach, su sach, te sach
tue lao » te lao
tuc cao » thuc cao, tuc co, tuc cac

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 tri tue lao khoa kham thong ) or ( thu hoach tren tuc cao khoan phap thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tri tue lao khoa kham thong ) OR ( thu hoach tren tuc cao khoan phap thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tri tue lao khoa kham thong ) or ( thu hoach tren tuc cao khoan phap thong ))*.