Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nhanh hai » nhanh thai, thanh hai, nhanh ha
cua triet » cua viet, su triet, va triet
hanh hai » thanh hai, hang hai, hanh tai
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, duc van
nang xa » lang xa, nang ma, mang xa
cac luc » cau luc, coc luc, cac nuoc
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y ((nang xa) or (nang x)) hoi. hieu ve cac luc van ((hanh hai) OR (nhanh hai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang xa) OR (nang x)) hoi. hieu ve cac luc van ((hanh hai) OR (nhanh hai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((nang xa) or (nang x)) hoi. hieu ve cac luc van ((hanh hai) OR (nhanh hai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang xa) or (nang x)) hoi. hieu ve cac luc van ((hanh hai) OR (nhanh hai)) cua triet*.