Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
hieu van » thien van, lieu va, hieu ve
nhan luc » nang luc
tinh bai » tinh bac, tinh hai, hinh bai
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
luc may » truc may, phuc may
bai cuu » bai cua, bai cung
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: ((hoc sach) OR (hoc sinh)) ky nang xa hoi. ((hieu va) or (hieu van)) nhan luc may tinh bai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc sinh)) ky nang xa hoi. ((hieu va) OR (hieu van)) nhan luc may tinh bai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc sinh)) ky nang xa hoi. ((hieu va) or (hieu van)) nhan luc may tinh bai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc sinh)) ky nang xa hoi. ((hieu va) or (hieu van)) nhan luc may tinh bai cuu tre*.