Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach tai » sach bai, sach tham, sach xa
hanh tai » thanh tai, hang tai, han tai
sach dao » lanh dao
nam thuc » nam thuoc, am thuc, nam thu
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, dam thuc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
tai su » tai so, tai tu, lai su

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 tai) OR (sach dao)) lang xa hoi. hieu va ((cam tuc) or (nam thuc)) va hanh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tai) OR (sach dao)) lang xa hoi. hieu va ((cam tuc) OR (nam thuc)) va hanh tai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tai) OR (sach dao)) lang xa hoi. hieu va ((cam tuc) or (nam thuc)) va hanh tai su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tai) OR (sach dao)) lang xa hoi. hieu va ((cam tuc) or (nam thuc)) va hanh tai su triet*.