Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (su sach)) ky nang xa hoi. hieu ve cam tuc va hang di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (su sach)) ky nang xa hoi. hieu ve cam tuc va hang di su triet.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (su sach)) ky nang xa hoi. hieu ve cam tuc va hang di su triet*.