Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van phan » van phong, van thanh, luan phan
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va phan » va phat, va phap, hoa phan
lap cua » lai cua, tap cua, lam cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuat sach)) ky nang x ho. hieu ve cam tuc ((va phan) OR (van phan)) lap cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuat sach)) ky nang x ho. hieu ve cam tuc ((va phan) OR (van phan)) lap cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu hoach) or (thuat sach)) ky nang x ho. hieu ve cam tuc ((va phan) OR (van phan)) lap cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuat sach)) ky nang x ho. hieu ve cam tuc ((va phan) OR (van phan)) lap cua tre*.