Perhaps you should try some spelling variations:
thuoc sach » hoc sach, thuat sach, thuoc sinh
nuoc sach » nguoi sach, hoc sach, cuoc cach
tham nang » nham nang, tham lang, tham nhung
cac luc » cau luc, cac nuoc, cac cuoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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 (nuoc sach)) tham nang xa hoi. hieu va ((cac luc) or (coc luc)) va dan di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (nuoc sach)) tham nang xa hoi. hieu va ((cac luc) OR (coc luc)) va dan di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) OR (nuoc sach)) tham nang xa hoi. hieu va ((cac luc) or (coc luc)) va dan di cua tu".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) OR (nuoc sach)) tham nang xa hoi. hieu va ((cac luc) or (coc luc)) va dan di cua tu*.