Perhaps you should try some spelling variations:
han thai » han tai, ban thai, van thai
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
nang xa » nang x, lang xa, nang ma
thai va » thai van
tuc va » thuc va, truc va, tuc xa
va han » va phan, van han, va hanh
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach thu)) nang xa hoi. hieu ((ve cham) or (va cham)) tuc va han thai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) nang xa hoi. hieu ((ve cham) OR (va cham)) tuc va han thai va thiet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) nang xa hoi. hieu ((ve cham) or (va cham)) tuc va han thai va thiet*.