Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ty nang » ky nang, ty hang, ly nang
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va kinh » va tinh, qua kinh
doi cua » dai cua, hoi cua
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, de cua, do cua

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 ((ty nang) or (ty xang)) xa hoi. hieu va cac tuc va kinh ((di cua) or (doi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty xang)) xa hoi. hieu va cac tuc va kinh ((di cua) OR (doi cua)) te.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) or (ty xang)) xa hoi. hieu va cac tuc va kinh ((di cua) or (doi cua)) te*.