Perhaps you should try some spelling variations:
thien van » thi van
sach kem » hanh kem
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
nam duc » nam duoc, pham duc, nam thuc
va hanh » van hanh, va thanh, va danh
di su » doi su, da su, de su
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach kem) or (sach ty)) nang xa hoi. thien van nam duc va hanh ((di su) OR (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sach ty)) nang xa hoi. thien van nam duc va hanh ((di su) OR (ki su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach kem) or (sach ty)) nang xa hoi. thien van nam duc va hanh ((di su) OR (ki su)) triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach ty)) nang xa hoi. thien van nam duc va hanh ((di su) OR (ki su)) triet*.