Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien bach » vien bach, hien hanh, dien sach
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tuc » cua duc, cua thuoc, luat tuc
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua tu » cua su, cua cu, cua te

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ty nang xa hoi. hieu ((hien bach) or (thien hach)) nuoc va dan vi ((cua tu) OR (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ty nang xa hoi. hieu ((hien bach) OR (thien hach)) nuoc va dan vi ((cua tu) OR (cua tuc))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ty nang xa hoi. hieu ((hien bach) or (thien hach)) nuoc va dan vi ((cua tu) OR (cua tuc))*".