Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
cam thuc » am thuc, nam thuc, cam thu
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, tu cach
te sach » toc sach
cao hoc » co hoc, cho hoc, chat hoc
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cao
vi su » va su, ve su, ki su

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) or (te sach)) ((y nang) OR (v nang)) cao hoc. lieu va cam thuc vat thanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ((y nang) OR (v nang)) cao hoc. lieu va cam thuc vat thanh vi su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ((y nang) OR (v nang)) cao hoc. lieu va cam thuc vat thanh vi su tien".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ((y nang) OR (v nang)) cao hoc. lieu va cam thuc vat thanh vi su tien*.