Perhaps you should try some spelling variations:
tru nang » tra nang, tri nang, truc nano
cham duc » pham duc, cham soc, pham duy
va tich » va tinh, va dich
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
so sach » so sanh, bo sach, co sach
tu lang » cu lang, tu lanh, xu lang
tu nang » tu nong, tu nano, vu nang
va chu » va che, va cau, va chi
chu te » chu de, chu tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((((tu nang) or (tu lang))) or (tru nang)) xa hoi. hieu vu cham duc va tich va chu te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((((tu nang) OR (tu lang))) OR (tru nang)) xa hoi. hieu vu cham duc va tich va chu te.
• Adding a wildcard symbol may retrieve word variants: so sach ((((tu nang) or (tu lang))) or (tru nang)) xa hoi. hieu vu cham duc va tich va chu te*.