Perhaps you should try some spelling variations:
thien van » thi van
tinh bai » tinh bac, tinh hai, hinh bai
nhan luc » nang luc
va tinh » may tinh
ca tren » cau tren, cu tren, la tren
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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 ky) OR (sac ky)) nang xa hoi. ((hieu ve) or (thien van)) nhan luc va tinh bai ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sac ky)) nang xa hoi. ((hieu ve) OR (thien van)) nhan luc va tinh bai ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) OR (sac ky)) nang xa hoi. ((hieu ve) or (thien van)) nhan luc va tinh bai ca tren".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) OR (sac ky)) nang xa hoi. ((hieu ve) or (thien van)) nhan luc va tinh bai ca tren*.