Perhaps you should try some spelling variations:
tim triet » tu triet
vi triet » ve triet, va triet, va trien
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
truc va » thuc va, thuc vat, trung va
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sac ky)) nang xa hoi. hieu va cau truc va thanh va ((vi triet) OR (tim triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang xa hoi. hieu va cau truc va thanh va ((vi triet) OR (tim triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sac ky)) nang xa hoi. hieu va cau truc va thanh va ((vi triet) OR (tim triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang xa hoi. hieu va cau truc va thanh va ((vi triet) OR (tim triet))*.