Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ha » hieu hoa, hieu va, hieu ca
vai su » van su, lai su, tai su
ha am » hoa am, ha nam, ha lam

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((nang xa) OR (lang xa)) hoi. hieu ha am thuc dan hanh ((vai su) or (va su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (lang xa)) hoi. hieu ha am thuc dan hanh ((vai su) OR (va su)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((nang xa) OR (lang xa)) hoi. hieu ha am thuc dan hanh ((vai su) or (va su)) triet*".