Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
han tai » hang tai, nhan tai, van tai
van han » van hanh, van phan, van nhan
duc van » duc va, duc tan, duc manh
cau duc » cao duc, cau luc, chu duc
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
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: tu sach ky ((nang xa) or (lang xa)) hoi. ((hieu van) OR (thien van)) cau duc van han tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang xa)) hoi. ((hieu van) OR (thien van)) cau duc van han tai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (lang xa)) hoi. ((hieu van) OR (thien van)) cau duc van han tai cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (lang xa)) hoi. ((hieu van) OR (thien van)) cau duc van han tai cua tu*.