Perhaps you should try some spelling variations:
thien van » thi van
ve triet » va trien, su triet
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
cac loc » cac lop, cac toc, cac hoc
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
loc va » hoc va, luc va
dai ve » dap ve, dau ve, dai va
tu sai » tu bai, tu san, tu cai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((nang xa) OR (lang xa)) hoi. ((lieu va) OR (thien van)) cac loc va hanh dai ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((nang xa) OR (lang xa)) hoi. ((lieu va) or (thien van)) cac loc va hanh dai ve triet~".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang xa) OR (lang xa)) hoi. ((lieu va) or (thien van)) cac loc va hanh dai ve triet*.