Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
nhan luc » nang luc
va nhan » van nhan, ca nhan, va phan
vai cuu » vai cua
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
van hoi » van hoc, van hoe, van loi
ky tang » ky nang, ky dang, kho tang
cuu tre » cua tre, cau tren, cau treo

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 (hoc sach)) ky tang ((van hoi) or (van hoa)). hieu va nhan luc van hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (hoc sach)) ky tang ((van hoi) OR (van hoa)). hieu va nhan luc van hanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky tang ((van hoi) or (van hoa)). hieu va nhan luc van hanh vai cuu tre*.