Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va trinh » van trinh, va tinh, lap trinh
trinh di » trinh do, trinh dien, trinh dinh
so sach » so sanh, bo sach, co sach
nang so » nang som, nang co, nang ho
lam tuc » lam thuoc, lam truoc, nam thuc
y nang » ky nang, ly nang, v nang
so hai » son hai, su hai, so ha
di cua » dai cua, doi cua, de cua
cua te » cua 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 y nang so hai. hieu van ((lam tuc) or (((luat tuc) OR (luat thue)))) va trinh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang so hai. hieu van ((lam tuc) OR (((luat tuc) OR (luat thue)))) va trinh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang so hai. hieu van ((lam tuc) or (((luat tuc) OR (luat thue)))) va trinh di cua te".
• Adding a wildcard symbol may retrieve word variants: so sach y nang so hai. hieu van ((lam tuc) or (((luat tuc) OR (luat thue)))) va trinh di cua te*.